低碳化学与化工2025，Vol.50Issue(5)：32-39,8.DOI:10.12434/j.issn.2097-2547.20240215
Mn助剂对KFeCuZn催化剂结构及其CO2加氢制C2+醇催化性能的影响
Effects of Mn additive on structures of KFeCuZn catalysts and their catalytic performances for CO2 hydrogenation to C2+alcohols
摘要
Abstract
The catalytic hydrogenation of CO2 to C2+alcohols(alcohols with two or more carbon atoms)is one of the important pathways for the high-value utilization of CO2 and the achievement of"carbon peak and carbon neutrality",and the construction of catalysts is the key to achieve high activity and stability in CO2 hydrogenation to C2+alcohols.To investigate the effects of Mn additive on structures of KFeCuZn catalysts and their catalytic performances for CO2 hydrogenation to C2+alcohols(hereinafter referred to as"catalytic performances"),KFeCuZnMnx catalysts with different Mn addition amounts were prepared by co precipitation method,and they were characterized by XRD,XPS,SEM,N2 physical adsorption/desorption,H2-TPR and CO2-TPD.The catalytic performances of KFeCuZnMnx catalysts were tested under reaction conditions of 300 ℃,3 MPa,V(CO2)∶V(H2)∶V(Ar)=20∶60∶10,and space velocity of 1800 h1.The results show that Mn acts as structural additive,and moderate addition of Mn can cause varying degrees of metal to metal interactions with other metals,so as to affect the specific surface areas and particle sizes of catalysts.At the same time,Mn,as electronic additive,undergoes electron transfer between Fe,and forms Fe-Mn-O active phase,which affects the reduction performances of catalysts and effectively improves their catalytic performances.KFeCuZnMn1.8 catalyst has good metal dispersibility and a large specific surface area,which can expose more effective active sites.Its CO2 conversion rate reaches 40.1％,and total alcohol selectivity reaches 20.3％,and the proportion of C2+alcohols in the total alcohols(mass fraction)is as high as 95.6％.Therefore,by precisely controlling the addition amount of Mn,the catalyst structures can be effective regulated,thereby increasing the C2+alcohol selectivity.关键词
CO2加氢/C2+醇/Mn助剂/结构助剂/电子助剂Key words
CO2 hydrogenation/C2+alcohols/Mn additive/structural additive/electronic additive分类
化学工程引用本文复制引用
盛海兵,孙燕,孙启文..Mn助剂对KFeCuZn催化剂结构及其CO2加氢制C2+醇催化性能的影响[J].低碳化学与化工,2025,50(5):32-39,8.基金项目
国家重点研发计划(2023YFB4103200). （2023YFB4103200）
